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Describe relationships with the example. Also illustrate degree of relationship for that example. Describe the different operations of relational algebra with suitable example each.
Write down SQL query for the following
i. To locate student who scored more than ‘Rashmi' in computer Science subject.ii. Write all the students who belongs to class II
It is not uncommon to have to access the data which reside in different tables, especially when formulating a report.
Sketch an object-oriented model for a small private airport database that is used to keep track of airplanes, their owners, airport employees, and pilots.
Using data mining, it is possible to gather information which has been buried that can be manipulated and cross indexed which could be a valuable information gathering technique for entities.
To analyse a set of data, and write a memo, identifying and explaining your insights into the operation of Todd Restaurants.
Create ERD containing Order and Customer entity types connected by 1-M relationship from Customer to Order. Select suiatble relationship name using your common knowledge of intersection.
What about giving same name to attributes which are in different tables but are not same? For instance, "Description" in both a Course table and a Classroom table.
Why are these so significant yet so frequently ignored by developers? Write the long term problems when these constraints are not implemented? "
Write down the complete transaction using SQL.
What is Recovering a database via rollforward? What is aim of transaction log? What is contained in transaction log?
Find the maximum salary of all employees who are not managers. Give all the managers in the database a 10 percent salary raise. Give all the other employees a 5 percent salary raise.
What rules would have to be enforced based on entity type? Choose one entity type and discuss what enforcement is needed by the database or application.
Show all the data in each of the four tables. Do not show foreign key columns. Write names and e-mail addresses for all customers who have had a stove repair that cost more than $50.
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